EP0351946A2 - Commande de l'instant d'allumage par étincelle - Google Patents

Commande de l'instant d'allumage par étincelle Download PDF

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Publication number
EP0351946A2
EP0351946A2 EP89305256A EP89305256A EP0351946A2 EP 0351946 A2 EP0351946 A2 EP 0351946A2 EP 89305256 A EP89305256 A EP 89305256A EP 89305256 A EP89305256 A EP 89305256A EP 0351946 A2 EP0351946 A2 EP 0351946A2
Authority
EP
European Patent Office
Prior art keywords
counter
clock pulses
count
pulses
crankshaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP89305256A
Other languages
German (de)
English (en)
Other versions
EP0351946B1 (fr
EP0351946A3 (en
Inventor
Mark C. Hansen
Greg J. Manlove
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Delco Electronics LLC
Original Assignee
Delco Electronics LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Delco Electronics LLC filed Critical Delco Electronics LLC
Publication of EP0351946A2 publication Critical patent/EP0351946A2/fr
Publication of EP0351946A3 publication Critical patent/EP0351946A3/en
Application granted granted Critical
Publication of EP0351946B1 publication Critical patent/EP0351946B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P5/00—Advancing or retarding ignition; Control therefor
    • F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P5/00—Advancing or retarding ignition; Control therefor
    • F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
    • F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
    • F02P5/15—Digital data processing
    • F02P5/1502—Digital data processing using one central computing unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P7/00—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices
    • F02P7/06—Arrangements of distributors, circuit-makers or -breakers, e.g. of distributor and circuit-breaker combinations or pick-up devices of circuit-makers or -breakers, or pick-up devices adapted to sense particular points of the timing cycle
    • F02P7/077—Circuits therefor, e.g. pulse generators
    • F02P7/0775—Electronical verniers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Definitions

  • This invention relates to an electronic spark timing control for an electronic internal combustion engine ignition system and more particularly to a spark timing control that when in operation maintains spark advance at a constant value regardless of variation in engine speed. This invention also relates to a method of developing a spark timing advance signal.
  • Spark timing controls for internal combustion engine ignition apparatus are sometimes provided with a bypass control that controls spark timing during starting of the engine and during a failure or malfunction of a programmed microprocessor that otherwise controls spark timing.
  • a bypass control that controls spark timing during starting of the engine and during a failure or malfunction of a programmed microprocessor that otherwise controls spark timing.
  • One example of this is the spark timing control disclosed in the US patent No. 4,711,226.
  • spark advance is controlled solely as a function of engine speed.
  • the spark advance control characteristic is such that spark advance is increased linearly with increasing engine speed until engine speed reaches a predetermined engine speed.
  • the spark advance is maintained at a constant value at all engine speeds above the predetermined engine speed.
  • This invention relates to a spark timing control for maintaining spark advance at a constant value at engine speeds above a predetermined engine speed.
  • a method of developing a spark timing advance signal, and a spark timing control, in accordance with the present invention is characterised by the features specified in the characterising portions of Claims 1 and 3 respectively.
  • the spark timing control of this invention utilizes an up-counter and a down-counter. Both counters are connected to a digital comparator which compares the count magnitudes of the up- and down-counters. When the count in the down-counter becomes less than or equal to the count in the up-counter, the digital comparator develops an output signal which can be used to cause the firing of a spark plug.
  • the spark timing control responds to a series of pulses that are developed in synchronism with the rotation of a crankshaft of an engine.
  • a pulse can be developed, for example, at each 60 degrees of rotation of the crankshaft.
  • the up-counter is supplied with constant frequency clock pulses during each 60 degree period between a pair of consecutively occurring crankshaft pulses.
  • the pulses counted by the up-counter during each 60 degree period are loaded into the down-counter.
  • the down-counter is now counted down by constant frequency clock pulses and the up-counter is counted up from zero by constant frequency clock pulses.
  • a spark plug firing control signal is developed by the digital comparator. The net result of the signal processing that has been described is that spark advance will be maintained at a constant value regardless of engine speed.
  • bypass spark advance control systems develop a linear variation of spark advance with engine speed and when engine speed exceeds a predetermined value, spark advance is maintained constant.
  • This invention relates only to the development of the constant spark advance with varying engine speed and accordingly the description of this invention is limited to a spark timing control that provides the constant advance. It will be appreciated that the spark timing control of this invention would be enabled whenever engine speed exceeds a predetermined engine speed. Below that engine speed the spark timing control of this invention would not be used.
  • the reference numeral 10 designates a (spark-ignited internal combustion) engine.
  • the crankshaft of the engine 10 is connected to a disk or wheel 12 which has six slots 14.
  • the slots 14 are equally angularly spaced and the angle between pairs of slots is 60 degrees.
  • the slots 14 cooperate with a pick-up 16 which develops a voltage signal each time a slot 14 passes pick-up 16.
  • the pick-up 16 may be of the magnetic type and may include a pick-up coil.
  • the pick-up 16 is connected to a squaring circuit 18 which develops square wave pulses on line 20.
  • Disk 12, slots 14, pick-up 16 and squaring cicuit 18 thereby define pulse developing means.
  • Two consecutive occurring square wave pulses 20A and 20B are shown in the drawing which are produced as disk 12 rotates. These pulses on line 20 are all 60 crankshaft degrees apart and six pulses are developed for every crankshaft revolution.
  • the line 20 is connected to a (synchronous one-shot) multivibrator 22.
  • the multivibrator 22 is connected to a line 24 and to another (synchronous one-shot) multivibrator 26.
  • the multivibrators 22 and 26 are suitably synchronized to a source (clock 30) of constant frequency clock pulses.
  • the multivibrator 26 is connected to the reset terminal of an up-counter 28.
  • the clock input of up-counter 28 is connected to clock 30 by line 32, (clock pulse frequency) divider 34 and line 36.
  • the clock 30 develops a series of clock pulses having a constant frequency of about 125 KHz.
  • the divider 34 may have a divider factor or ratio of four so that the frequency of the clock pulses on line 36 is 31.25 KHz.
  • the up-counter 28 operates as a tach-counter and counts up the clock pulses on line 36 between consecutive occurring 60 degree crankshaft pulses. More specifically, up-counter 28 counts the constant frequency clock pulses on line 36 for each period of 60 degrees of crankshaft rotation.
  • the up-counter 28 is connected to a down-counter 38 by line 40.
  • the load terminal of down-counter 38 is connected to multivibrator 22 by line 24.
  • a 60 degree pulse occurs on line 20 a signal is developed on line 24 after a short delay provided by multivibrator 22. This signal is applied to the load terminal of down-counter 38 which causes the count in up-counter 28 to be loaded into down-counter 38 via line 40.
  • the count in up-counter 28 is reset to zero and after this takes place the up-counter starts to count up clock pulses on line 36 from a zero count magnitude.
  • the count so loaded into down-counter 38 replaces or is substituted for the count that was previously in down-counter 38.
  • the down-counter 38 has a clock input terminal that is connected to clock 30 by line 32, line 42, (clock pulse frequency) divider 44 and line 46.
  • the divider 44 divides the output frequency of clock 30 by a factor so that the clock pulses on line 46 have a lower frequency than the frequency of the clock pulses developed by clock 30.
  • the relative frequencies of the clock pulses on lines 36 and 46 and the manner in which this relationship determines spark advance will be described hereinafter.
  • the spark timing control has a digital comparator 50 connected to up-counter 28 by line 52 and connected to down-counter 38 by line 54.
  • the digital comparator 50 compares the digital count in up-counter 28 with the digital count in down-counter 38. When the count in down-counter 38 becomes less than or equal to the count in up-counter 28, the digital comparator 50 develops an output signal on output line 56 which is used to cause the firing of a spark plug in an ignition apparatus (not illustrated).
  • the up-counter 28 and down-counter 38 cooperate such that the down-counter 38 contains a count that is a function of the duration of time required for the engine crankshaft to move through 60 degrees.
  • a 60 degree pulse occurs on line 20
  • the following events occur.
  • the attained up-count of up-counter 28 is transferred or loaded into down-counter 38.
  • the up-counter 28 is then reset to zero count and begins to count up the clock pulses on line 36.
  • up-counter 28 is now beginning to count up from zero and down-counter 38 is beginning to count down from a count value corresponding to a previous 60 degree period.
  • each time a 60 degree crankshaft pulse occurs up-counter 28 starts to count up from a zero count and down-counter 38 starts to count down from a count magnitude that corresponds to a previous 60 degree period of crankshaft rotation.
  • the digital comparator 50 is comparing the counts in the counters.
  • the count in down-counter 38 decreases to a magnitude that is equal to or slightly less than the increasing count in up-counter 28 a signal is developed on output line 56 which can be used to cause the firing of a spark plug.
  • dividers 34 and 44 both divide the input frequency by a factor of four so that up- and down-counters 28 and 38 are supplied with clock pulses of the same frequency.
  • T the number of clock pulses counted by up-counter 28 during a 60 degree period.
  • spark timing control is configured such that spark advance is maintained constant.
  • the amount of spark advance will no longer be 30 degrees.
  • the divider ratio of frequency divider 34 is four (divide by four) and that the divider ratio of divider 44 is eight (divide by eight). With these assumptions the rate or frequency of the clock pulses on line 46 is one-half of the frequency of the clock pulses on line 36. For every two clock pulses that is up-counted by up-counter 28, down-counter 38 will down-count one clock pulse.
  • the frequency of clock 30 is 125 KHz and the divider 34 has a divider ratio of four so that the frequency of the pulses on line 36 is 31.25 KHz.
  • the divider ratio of divider 44 can be selected to be between four and sixteen in increments of one to produce a fixed spark advance that varies in corresponding steps from 30 degrees to 12 degrees. Putting it another way, thirteen different advance angles can be selected by selecting the divider ratio of divider 44 such that the divider ratio is some whole number between four and sixteen.
  • spark advance angles could be obtained within this range, namely, 30 degrees where the divider ratio of divider 44 is one, 20 degrees where the divider ratio of divider 44 is two, 15 degrees where the divider ratio of divider 44 is three and 12 degrees where the divider ratio of divider 44 is four.
  • a fast clock rate for clock 30 125 KHz
  • a lower clock rate 31.25 KHz

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing (AREA)
  • Electrical Control Of Ignition Timing (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
EP89305256A 1988-07-19 1989-05-24 Commande de l'instant d'allumage par étincelle Expired - Lifetime EP0351946B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US07/221,493 US4841932A (en) 1988-07-19 1988-07-19 Spark timing control
US221493 1988-07-19

Publications (3)

Publication Number Publication Date
EP0351946A2 true EP0351946A2 (fr) 1990-01-24
EP0351946A3 EP0351946A3 (en) 1990-08-01
EP0351946B1 EP0351946B1 (fr) 1994-03-02

Family

ID=22828053

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89305256A Expired - Lifetime EP0351946B1 (fr) 1988-07-19 1989-05-24 Commande de l'instant d'allumage par étincelle

Country Status (6)

Country Link
US (1) US4841932A (fr)
EP (1) EP0351946B1 (fr)
JP (1) JPH0267463A (fr)
KR (1) KR930008000B1 (fr)
CA (1) CA1321615C (fr)
DE (1) DE68913379T2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0223268A (ja) * 1988-07-13 1990-01-25 Toyota Motor Corp 内燃機関用点火時期制御装置
US4924831A (en) * 1989-07-10 1990-05-15 R. E. Phelon Company, Inc. Capacitor discharge ignition system with microprocessor timing control
US5228066A (en) * 1992-04-22 1993-07-13 Digital Equipment Corporation System and method for measuring computer system time intervals
US5444403A (en) * 1992-12-22 1995-08-22 Kabushiki Kaisha Toshiba Duty discriminating circuit
JPH094553A (ja) * 1995-04-19 1997-01-07 Mitsuba Electric Mfg Co Ltd 原動機の進角制御方法

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2331204A1 (fr) * 1975-11-07 1977-06-03 Texas Instruments France Dispositif de multiplication de frequence et ses applications au codage angulaire d'un organe rotatif et a l'allumage electronique d'un moteur
DE2823659A1 (de) * 1977-05-30 1978-12-07 Nippon Soken Elektronische zuendvorrichtung und elektronisches zuendsteuerverfahren fuer einen verbrennungsmotor
DE2802582A1 (de) * 1978-01-21 1979-07-26 Bbc Brown Boveri & Cie Elektronischer drehwinkelgeber
DE2824885A1 (de) * 1978-06-07 1979-12-20 Bosch Gmbh Robert Einrichtung zum steuern von betriebsparameterabhaengigen und sich wiederholenden vorgaengen fuer brennkraftmaschinen
DE3034441A1 (de) * 1980-09-12 1982-04-29 Robert Bosch Gmbh, 7000 Stuttgart Zuendanlage fuer brennkraftmaschinen
EP0109675A2 (fr) * 1982-11-22 1984-05-30 Hitachi, Ltd. Dispositif électronique de commande d'allumage
US4575865A (en) * 1983-05-16 1986-03-11 Rca Corporation System for determining time duration of angular rotation
US4646696A (en) * 1984-12-06 1987-03-03 Outboard Marine Corporation Programmed electronic advance for engines
EP0300896A1 (fr) * 1987-07-24 1989-01-25 Siemens Automotive S.A. Dispositif de déclenchement d'évènement en phase avec une position angulaire d'un organe rotatif et son application

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3738339A (en) * 1971-12-06 1973-06-12 Gen Motors Corp Electronic ignition spark advance system
US4638498A (en) * 1980-06-20 1987-01-20 Rca Corporation Digital timing system
US4642772A (en) * 1983-05-16 1987-02-10 Rca Corporation System for determining time duration of angular rotation
AT386256B (de) * 1984-07-02 1988-07-25 Atlas Fahrzeugtechnik Gmbh Anordnung zur erzeugung eines ausloeseimpulses fuer die zuendung einer brennkraftmaschine
US4741310A (en) * 1985-05-30 1988-05-03 Honda Giken Kogyo Kabushiki Kaisha Ignition timing control system for internal combustion engine
JPH0639947B2 (ja) * 1986-05-08 1994-05-25 株式会社日立製作所 低圧電子配電点火装置

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2331204A1 (fr) * 1975-11-07 1977-06-03 Texas Instruments France Dispositif de multiplication de frequence et ses applications au codage angulaire d'un organe rotatif et a l'allumage electronique d'un moteur
DE2823659A1 (de) * 1977-05-30 1978-12-07 Nippon Soken Elektronische zuendvorrichtung und elektronisches zuendsteuerverfahren fuer einen verbrennungsmotor
DE2802582A1 (de) * 1978-01-21 1979-07-26 Bbc Brown Boveri & Cie Elektronischer drehwinkelgeber
DE2824885A1 (de) * 1978-06-07 1979-12-20 Bosch Gmbh Robert Einrichtung zum steuern von betriebsparameterabhaengigen und sich wiederholenden vorgaengen fuer brennkraftmaschinen
DE3034441A1 (de) * 1980-09-12 1982-04-29 Robert Bosch Gmbh, 7000 Stuttgart Zuendanlage fuer brennkraftmaschinen
EP0109675A2 (fr) * 1982-11-22 1984-05-30 Hitachi, Ltd. Dispositif électronique de commande d'allumage
US4575865A (en) * 1983-05-16 1986-03-11 Rca Corporation System for determining time duration of angular rotation
US4646696A (en) * 1984-12-06 1987-03-03 Outboard Marine Corporation Programmed electronic advance for engines
EP0300896A1 (fr) * 1987-07-24 1989-01-25 Siemens Automotive S.A. Dispositif de déclenchement d'évènement en phase avec une position angulaire d'un organe rotatif et son application

Also Published As

Publication number Publication date
KR900001970A (ko) 1990-02-27
KR930008000B1 (ko) 1993-08-25
EP0351946B1 (fr) 1994-03-02
DE68913379D1 (de) 1994-04-07
JPH0267463A (ja) 1990-03-07
CA1321615C (fr) 1993-08-24
EP0351946A3 (en) 1990-08-01
US4841932A (en) 1989-06-27
DE68913379T2 (de) 1994-06-01

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